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Clunking in driveline when roads are wet EL falcon 

 

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 Post subject: Clunking in driveline when roads are wet EL falcon
Posted: Tue Aug 14, 2007 8:05 pm 
Getting Side Ways
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Location: Brackistan
VIC, Australia

I've got this strange problem (like everything on my cursed sh itbox car)

Only happens when the roads are wet and consequently has wet the driveline.

Its got a 5 speed in it if that makes any difference.

When you take off from the lights, you hear a solid THUD most likely from the driveline, somewhere out back. As you're cruising, if the lights ahead change and you need to stop, I drop it into second and one out of every two-three times, it will make another thud noise. Only if it's made the thud on decel will it do it again on acceleration.

Ok, so what it's not: gearbox (replaced), engine or gearbox mounts, front crossmember and tailshaft.

I also removed and refitted the rear axle (for other reasons - I had to rebuild the LSD when I fcked it at a drift day and to change the ratio). What else could it be? It's so hard to diagnose because it only happens when its wet and then you can't easily get under the car to find out whats moving.
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Posted: Tue Aug 14, 2007 8:08 pm 
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Backlash in the diff, dont ask me how to fix it, mines got the same problem along with a thousand other t5 owners
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Posted: Tue Aug 14, 2007 8:14 pm 
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I recently rebuilt the diff, new LSD centre and new gears, I set the contact pattern as good as it gets and it's well within spec. I dont believe the new diff centre that's setup exactly the same as I've set up other diff centres could make the same noise before and after I pulled it apart and rebuilt it.

I also put new bearings on the front & rear of the pinion.
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Posted: Tue Aug 14, 2007 8:23 pm 
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Ride: Ford FPV FG F6 310

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it wouldnt' be the top trailing arm bracket would it?
im guessing you would have already checked all your trailing arm bushes, swaybar, panhard rod bushes and shocks when your diff was removed.

 

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Posted: Tue Aug 14, 2007 10:08 pm 
Getting Side Ways
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Dont know mate, the bushes do have signs of aging rubbers and cracks in them but I woudln't have thought there's enough to make this sort of noise. I've seen much worse condition rubbers and they were silent, albeit sloppy in the handling department. That said I didn't pull out the arms from the chassis so I dont know if they're completely stuffed, i'm hoping to find the quick-fix on here :)

The best analogy I can make is a loose tailshaft to pinion flange mating, as if you've left the four bolts loose. The thud is deep and felt throughout the body, in fact it's quite similar to worn ball joints on the steering when they thud.....
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Posted: Tue Aug 14, 2007 10:15 pm 
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i've got the same s**t in my car! f**k annoying....
it'd be interesting to know if its just the converted cars or not...
i know smokes doesnt make those noises...

 

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Posted: Tue Aug 14, 2007 10:18 pm 
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gotta love the factory manuals!
hahah the old ef i had made a clunk sometimes, but weather didnt make a difference.
it turned out to be a rock caught between the chassis and the lower control arm.

having said that, can you feel it on any side or is it more centralish?

 

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Posted: Tue Aug 14, 2007 11:02 pm 
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Tail shaft isn't touching the tunnel is it?

I was having major banging from my car a while ago, turned out to be uppers and the tail shaft combined.

You may notice it more in the wet as traction is lost and a slight tramp may trigger the thud.

Look around 15cm up the tail shaft from the diff yolk for a ring of wear.

 

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Posted: Wed Aug 15, 2007 8:50 pm 
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Poked my head under the car today and the tailshaft is fine. I'd have been worried if I missed that in the times I'd pulled it out to replace the box/clutch/diff etc :)

I really dont know what it could be, everything seems tight by hand. It's another one of these problems i'm just going to have to put up with until another part falls off while driving....
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Posted: Thu Aug 16, 2007 7:56 pm 
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My car had the same problem, turned out to be the trailing arm bolts were just a little loose allowing it to move back and forward.
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Posted: Sun Aug 19, 2007 2:41 pm 
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my guess- bushes or bush bolts loose.
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Posted: Sun Aug 19, 2007 4:12 pm 
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i had this problem in my ef for a while but that was brocken spider gear shaft so they were all floping around and doing what they wanted dont even no how it got me home...
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Posted: Sun Aug 19, 2007 9:26 pm 
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i have this problem to on my el ghia, which is an auto,

onl;y happens in the wet, and the brakes are a lot harder to push even when im only slowing down a tiny bit in speed, the clunking happens on the softest take of and stopping, but in the dry it dont' happen, even harsh stopping and starting, only in the wet.
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Posted: Wed Aug 22, 2007 7:14 am 
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Update - I removed the axle and checked all bushes on all links and all are showing their age however still serviceable. I think I found the problem, two of the nylon threaded bolts that hold the LPG tank brackets in place underneath the car were'nt completely tight. I tightened each about 1.5 turns until I felt resistance.

Now awaiting a rainy day.
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Posted: Wed Aug 22, 2007 10:28 am 
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how are your uni joints?
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